Hi Bill,
Look like no-one has one or used one.
But looking around other sites, they seem to be reasonably popular for such a low priced item.
The older hands usually have all the stuff to give themselves or check the angles, so another bit of kit is not usually required. Hence maybe the lack of purchasing.
I know our John S has something similar for his hand held electricalonic wotsit, and he reckons it is rather accurate.
http://madmodder.net/index.php?topic=638.msg3223#msg3223If you haven't already got angle equipment, it could be a good investment.
Then you could show us all why we should get one.
John